<!DOCTYPE html>
<html lang="zh-cn">

	<head>
		<meta charset="UTF-8">
		<title class="title">[文件管理器]</title>
		<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
		<style type="text/css">
			.content {background: transparent;}
			.btn {position: relative;top: 0;left: 0;bottom: 0;right: 0;}
			.btn .file {position: fixed;z-index: 93;left: 0;right: 0;top: 0;bottom: 0;width: 100%;opacity: 0;}
		</style>
	</head>

	<body>
		
		<div id="content" class="content">
			<div class="btn">
				<input :multiple="multiple" @change="onChange" :accept="accept" ref="file" class="file" type="file" />
			</div>
		</div>
		
		<script type="text/javascript" src="js/vue.min.js"></script>
		<script type="text/javascript">
			let _this;
			var vm = new Vue({
				el: '#content',
				data: {
					accept: '',
					multiple: true,
				},
				mounted() {
					console.log('加载webview');
					_this = this;
					this.files = new Map();
					document.addEventListener('plusready', (e)=>{
					let {debug,instantly,prohibited} = plus.webview.currentWebview();
					this.debug = debug;
					this.instantly = instantly;
					this.prohibited = prohibited;
					this.accept = prohibited.accept; 
					if (prohibited.multiple === 'false') {
						prohibited.multiple = false;
					}
					this.multiple = prohibited.multiple;
					location.href = 'callback?retype=updateOption';
					}, false);
				},
				methods: {
					toast(msg) {
						plus.nativeUI.toast(msg);
					},
					clear(name) {
						if (!name) {
							this.files.clear();
							return;
						}
						this.files.delete(name);
					},
					setData(option='{}') {
						this.debug&&console.log('更新参数：'+option);
						try{
							_this.option = JSON.parse(option);
						}catch(e){
							console.error('参数设置错误')
						}
					},
					async upload(name=''){
						if (name && this.files.has(name)) {
							await this.createUpload(this.files.get(name));
						}
						else {
							for (let item of this.files.values()) {
								if (item.type === 'waiting' || item.type === 'fail') {
									await this.createUpload(item);
								}
							}
						}
					},
					onChange(e) {
						let fileDom = this.$refs.file;
						for (let file of fileDom.files) {
							if (this.files.size >= this.prohibited.count) {
								this.toast(`只允许上传${this.prohibited.count}个文件`);
								fileDom.value = '';
								break;
							}
							this.addFile(file);
						}
						this.uploadAfter();
						fileDom.value = '';
					},
					addFile(file) {
						if (file) {
							let name = file.name;
							this.debug&&console.log('文件名称',name,'大小',file.size);
							// 限制文件格式
							let suffix = name.substring(name.lastIndexOf(".")+1).toLowerCase();
							let formats = this.prohibited.formats.toLowerCase();
							if (formats&&!formats.includes(suffix)) {
								this.toast(`不支持上传${suffix.toUpperCase()}格式文件`);
								return;
							}
							// 限制文件大小
							if (file.size > 1024 * 1024 * Math.abs(this.prohibited.size)) {
								this.toast(`附件大小请勿超过${this.prohibited.size}M`)
								return;
							}
							try{
								if (!this.prohibited.distinct) {
									let homonymIndex = [...this.files.keys()].findIndex(item=>{
										return (item.substring(0,item.lastIndexOf("("))||item.substring(0,item.lastIndexOf("."))) == name.substring(0,name.lastIndexOf(".")) &&
										item.substring(item.lastIndexOf(".")+1).toLowerCase() === suffix;
									})
									if (homonymIndex > -1) {
										name = `${name.substring(0,name.lastIndexOf("."))}(${homonymIndex+1}).${suffix}`;
									}
								}
							}catch(e){
								//TODO handle the exception
							}
							
							// let itemBlob = new Blob([file]);
							// let path = URL.createObjectURL(itemBlob);
							let path = URL.createObjectURL(file);
							this.files.set(name,{file,path,name: name,size: file.size,progress: 0,type: 'waiting'});
						}
					},
					/**
					 * @returns {Map} 已选择的文件Map集
					 */
					callChange() {
						location.href = 'callback?retype=change&files=' + escape(JSON.stringify([...this.files]));
					},
					/**
					 * @returns {object} 正在处理的当前对象
					 */
					changeFilesItem(item,end='') {
						this.files.set(item.name,item);
						location.href = 'callback?retype=progress&end='+ end +'&item=' + escape(JSON.stringify(item));
					},
					uploadAfter() {
						this.callChange();
						setTimeout(()=>{
							this.instantly&&this.upload();
						},1000)
					},
					createUpload(item) {
						this.debug&&console.log('准备上传,option=：'+JSON.stringify(this.option));
						item.type = 'loading';
						delete item.responseText;
						return new Promise((resolve,reject)=>{
							let {url,name,method='POST',header={},formData={}} = this.option;
							let form = new FormData();
							for (let keys in formData) {
								form.append(keys, formData[keys])
							}
							form.append(name, item.file);
							let xmlRequest = new XMLHttpRequest();
							xmlRequest.open(method, url, true);
							for (let keys in header) {
								xmlRequest.setRequestHeader(keys, header[keys])
							}
							xmlRequest.upload.addEventListener(
								'progress',
								event => {
									if (event.lengthComputable) {
										let progress = Math.ceil((event.loaded * 100) / event.total)
										if (progress <= 100) {
											item.progress = progress;
											this.changeFilesItem(item);
										}
									}
								},
								false
							);
							
							xmlRequest.ontimeout = () => {
								console.error('请求超时')
								item.type = 'fail';
								this.changeFilesItem(item,true);
								return resolve(false);
							}
							
							xmlRequest.onreadystatechange = ev => {
								if (xmlRequest.readyState == 4) {
									this.debug && console.log('接口是否支持跨域',xmlRequest.withCredentials); 
									if (xmlRequest.status == 200) {
										this.debug && console.log('上传完成：' + xmlRequest.responseText)
										item['responseText'] = xmlRequest.responseText;
										item.type = 'success';
										this.changeFilesItem(item,true);
										return resolve(true);
									} else if (xmlRequest.status == 0) {
										console.error('status = 0 :请检查请求头Content-Type与服务端是否匹配，服务端已正确开启跨域，并且nginx未拦截阻止请求')
									}
									console.error('--ERROR--：status = ' + xmlRequest.status) 
									item.type = 'fail';
									this.changeFilesItem(item,true);
									return resolve(false);
								}
							}
							xmlRequest.send(form)
						});
						
					}
				}
			});
			
		</script>
	</body>

</html>
